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Siemens TIM 1531 IRC Modules

Act Now10ICS-CERT ICSA-18-352-05Dec 11, 2018
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

The TIM 1531 IRC is a gateway/communication module used in Siemens industrial networks. All versions prior to v2.0 contain a vulnerability in how the device handles incoming requests on port 102/TCP (the S7 protocol used for PLC communication). An attacker can send malformed requests that the device does not properly validate, allowing arbitrary command execution with no authentication required. This gives complete remote control of the module and potentially the connected control systems.

What this means
What could happen
An attacker with network access to a TIM 1531 IRC module could gain complete remote control of the device, allowing them to execute arbitrary commands that could disrupt industrial control functions, modify network configurations, or launch attacks on connected systems.
Who's at risk
Organizations operating Siemens TIM 1531 IRC modules (including SIPLUS NET variants) in industrial networks, including water authorities, utilities, and manufacturing facilities that use these gateway devices for communications or remote monitoring.
How it could be exploited
An attacker on the network sends specially crafted requests to port 102/TCP (Siemens S7 communication protocol) on the TIM 1531 IRC module. No authentication is required. The device accepts and executes the malicious commands, giving the attacker full control of the module and its functions.
Prerequisites
  • Network access to port 102/TCP on the TIM 1531 IRC module
  • Device running firmware version earlier than v2.0
remotely exploitableno authentication requiredlow complexityhigh CVSS score (10/10)
Exploitability
Moderate exploit probability (EPSS 2.9%)
Affected products (1)
ProductAffected VersionsFix Status
TIM 1531 IRC (incl. SIPLUS NET variants): All<V2.0v2.0
Remediation & Mitigation
0/4
Do now
0/1
WORKAROUNDRestrict network access to port 102/TCP on TIM 1531 IRC to trusted IP addresses only using firewall rules
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpgrade TIM 1531 IRC firmware to version v2.0 or later
Long-term hardening
0/2
HARDENINGIsolate TIM 1531 IRC and control system networks from the business network using firewalls
HARDENINGMinimize direct Internet access to control system devices; use VPNs for required remote access
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